Note 7 - Stock-Based Compensation (Details) - Summary of Status of All Stock Option Plans (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Summary of Status of All Stock Option Plans [Abstract]
Number of Shares Outstanding	11,105,267	11,105,267	11,562,055	12,019,328
Options Outstanding, Weighted Average Exercise Price	$ 0.21	$ 0.21	$ 0.20	$ 0.21
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)	5 years 116 days	5 years 116 days
Options Outstanding, Aggregate Intrinsic Value	$ 72,600	$ 72,600
Number of Shares Exercised	(41,061)	(256,818)
Options Exercised, Weighted Average Exercise Price	$ 0.10	$ 0.19
Number of Shares, Forfeited or Expired	(415,727)	(657,243)
Options Forfeited or Expired, Weighted Average Exercise Price	$ 0.21	$ 0.21